Use a dash for no name contacts

Bug 28245773

Change-Id: Ibeaac23507a21b3ca4c7a806f2fa23f4471af0d4
diff --git a/res-common/values/donottranslate_config.xml b/res-common/values/donottranslate_config.xml
index 44c18e2..ad36362 100644
--- a/res-common/values/donottranslate_config.xml
+++ b/res-common/values/donottranslate_config.xml
@@ -91,5 +91,5 @@
     <string name="pref_privacy_policy_key">pref_privacy_policy</string>
     <string name="pref_terms_of_service_key">pref_terms_of_service</string>
 
-    <string name="star_sign">★</string>
+    <string name="star_sign">\u2605</string>
 </resources>